Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Principal components of other assets
Deferred debt issuance costs, net of amortization of $61,104 and $50,115, respectively	$ 54,856	$ 52,464
Deferred federal income tax asset	1,135	1,218
Lease incentives and lease premiums, net of amortization of $41,136 and $23,458, respectively	72,355	72,181
Flight equipment held for sale	31,040	9,474
Deposits Assets	0	10,000
Other assets	16,068	8,639
Total other assets	175,454	153,976
Amortization of deferred debt issuance costs	50,115	61,104
Amortization of lease incentives and lease premiums	$ 23,458	$ 41,136